43
Aermec cod. 5806715_00 12.01
NRP 0200-0750
EN
FL
FL
1
3
3
5
5
6
8
9
9
9
9
10
8
8
8
5
5
2
4
4
4
2
16
17
17
12
11
4
14
9
9
10
17
12
11
16
14
ATTENTION
The choice and installation of
components outside the NRP unit
is the installer's responsibility, who
must operate according to the
code of practice and in compliance
with the Standard in force in the
country of destination.
ATTENTION
The hydraulic connection pipes to
the machine must be suitably
dimensioned for the effective
water flow rate requested by the
system when running. The water
flow rate to the heat exchanger
must always be constant.
ATTENTION
Wash the system thoroughly
before connecting the unit. This
cleaning operation will eliminate
any residues such as welding drips,
scale, rust, or other impurities
from the piping. These substances
can also deposit inside and cause
machine malfunctioning. The
connection piping must be
adequately supported so that its
weight is not borne by the appli-
ance.
ATTENTION
An appropriate load/reintegration
system must be prepared, which is
engaged on the return line, along
with a drain cock in the lowest part
of the system. Water
disconnectors must be used in
systems loaded with anti-freeze or
where particular legal provisions
apply.
ATTENTION
Particular supply/reintegration
waters must be conditioned
with appropriate treatment
systems. The
"water features"
provided in the table can be used
as a reference.
ATTENTION
It is prohibited to release
water-glycol mixtures into the
environment.
ATTENTION
It is recommended to design
systems with high water content
(minimum recommended values
shown in
TAB 1
), in order to limit:
1. The hourly number of
inversions between operating
modes.
2. Drop in water temperature
during winter defrost cycles.
WATER FEATURES
PH
6-8
Electric conductivity
Less than 200 mV/cm (25°C)
Chloride ions
Less than 50 ppm
Sulphuric acid ions
Less than 50 ppm
Total iron
Less than 0.3 ppm
Alkalinity M
Less than 50 ppm
Total hardness
Less than 50 ppm
Sulphur ions
None
Ammonia ions
None
Silicone ions
Less than 30 ppm
TAB1
200 240 280 300 330 350 500 550 600 650 700 750
Number of compressors
n°
2
2
2
2
2
2
3
3
4
4
4
4
Minimum water content admitted
COLD SIDE
l/kW
7
7
7
7
7
7
7
7
7
7
7
7
Minimum water content admitted
the HOT SIDE
l/kW 10
10
10
10
10
10
10
10
10
10
10
10
Recommended water content cooling
side | heating side
l/kW 14
14
14
14
14
14
14
14
14
14
14
14
2
PIPE
S
YS
TEM
4
PIPE
S
YS
TEM
26. BASIC 4 PIPE SYSTEM HYDRAULIC CIRCUITS
26.1. INTERNAL AND EXTERNAL HYDRAULIC CIRCUIT TO NRP “°” standard
STANDARD NRP COMPONENTS FOR 4-PIPE SYSTEMS
1
Plate heat exchanger (COOLING SYSTEM SIDE)
2
Water filter (mounted)
3
Flow switches (mounted)
4
Air vent valve
5
Water IN/OUT temperature probes
6
Total recovery (HEATING SYSTEM SIDE)
RECOMMENDED COMPONENTS NOT SUPPLIED FOR WHICH INSTALLER IS RESPONSIBLE
8
Anti-vibration joints
9
Cutoff cocks
10
Pump
11
Safety valve
12
Expansion vessel
14
System Storage Tank
16
Drain cock
17
Manometer
NRP HYDRAULIC
COMPONENTS
RECOMMENDED HYDRAULIC COMPONENTS
EXTERNAL TO UNIT